Using hover caption kirupa---not working when loading external swf file

Hi,
Can someone please help me!??
I’m using the kirupa fla source file for the hover caption
http://www.kirupa.com/developer/mx2004/hover_captions.htm

and have created an external movie file where I want the hover captions to appear to be loaded into the main movie swf. The hover captions don’t work once this swf has been loaded but works as a standalone swf. Can someone please tell me how to fix this? Any advice appreciated. Thanks